/**
 * Environment Variable Parsing Utilities
 *
 * Standardized utilities for parsing environment variables with type safety
 * and consistent default handling.
 */
/**
 * Parse integer from environment variable with default
 *
 * @param key - Environment variable name
 * @param defaultValue - Default value if not set or invalid
 * @returns Parsed integer or default value
 *
 * @example
 * parseIntEnv('PORT', 3000) // Returns 3000 if PORT not set
 * parseIntEnv('MAX_SIZE', 100) // Returns 100 if MAX_SIZE is invalid number
 */
export declare function parseIntEnv(key: string, defaultValue: number): number;
/**
 * Parse string from environment variable with default
 *
 * @param key - Environment variable name
 * @param defaultValue - Default value if not set or empty
 * @returns Environment variable value or default
 *
 * @example
 * parseStringEnv('LOG_LEVEL', 'info') // Returns 'info' if LOG_LEVEL not set
 * parseStringEnv('LOG_LEVEL', 'info') // Returns 'info' if LOG_LEVEL is empty string
 */
export declare function parseStringEnv(key: string, defaultValue: string): string;
/**
 * Parse boolean from environment variable with default
 *
 * Recognizes common boolean string representations:
 * - true: 'true', '1', 'yes'
 * - false: 'false', '0', 'no'
 *
 * @param key - Environment variable name
 * @param defaultValue - Default value if not set or unrecognized
 * @returns Boolean value
 *
 * @example
 * parseBoolEnv('ENABLE_FEATURE', true) // Returns true if not set
 * parseBoolEnv('ENABLE_FEATURE', true) // Returns false if 'false', '0', or 'no'
 */
export declare function parseBoolEnv(key: string, defaultValue: boolean): boolean;
/**
 * Parse comma-separated list from environment variable
 *
 * Trims whitespace from each item and filters out empty strings.
 *
 * @param key - Environment variable name
 * @param delimiter - Delimiter to split on (default: ',')
 * @returns Array of trimmed, non-empty strings
 *
 * @example
 * parseListEnv('ALLOWED_HOSTS') // ['host1', 'host2'] if ALLOWED_HOSTS='host1, host2'
 * parseListEnv('TAGS', ';') // ['tag1', 'tag2'] if TAGS='tag1;tag2' with semicolon delimiter
 */
export declare function parseListEnv(key: string, delimiter?: string): string[];
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